Stadium BM701-3 Black Hole Brick Ventilators

The benefits of “Black hole” Stops wind blasting in - The air flow within the duct is slowed down by the change of direction and by the vortices formed, reducing draughts to a minimum. Stops light showing through - The occupier cannot see through the ventilator and is less likely to be worried that insects and vermin may enter the house through it. 100cm free area (rectangular only).